Archimedes Definition and 211 Threads

If an object floats in water, its density can be determined by tying a sinker on it so that both the object and sinker are submerged. Show that the specific gravity, (Density_substance)/(density_water at 4 degrees), is given by (w)/(w_1 - w_2), where w is the object's weight in air alone, w_1 is...

A ball of mass m_b and volume V is lowered on a string into a fluid of density p_f . Assume that the object would sink to the bottom if it were not supported by the string. What is the tension T in the string when the ball is fully submerged but not touching the bottom? Express your answer (T)...

An object is solid throuhgout. When the object is completely submerged in ethyl alcohol, its apparent weight is 15.2N. When completely submerged in water, its apparent weight is 13.7N. What is the volume of the object? This is my attempt: Weight of object in ethyl alcohol [Woe]= (density...

How would I best explain Archimedes Principle to kids 9-10? So they can understand it? I don't need any experiments, All I want is an easy explination on what it is and how it works so 10 year old kids can understand. And in the shortest amount of words...

A wooden cylinder 30.0 cm high floats vertically in a tub of water (density 1.00 g/cm^3). The top of the cylinder is 14.1 cm above the surface of the liquid. What is the density of the wood? Does the radius of the cylinder need to be known in order to relate height and volume? Obviously...

Ok, I've seen many proofs of this, all being the same, but the closest I could find online was here: http://freespace.virgin.net/mark.davidson3/IMS2121/buoyancy/Buoyancy.html Basically the idea is you mess around with the formulas for pressure and hey bingo. However, I have one question - the...

With the law of lever!

A wooden block 20 * 20 *10 cm^3 has a density of .6 g/ cm^3 (a) How much iron (density = 7.86 g/cm^3) can be placed on to p of the block if the top of the block is to be level with the water around it? (b) If iron were attached to the bottom of the block instead, what mass of iron would it...

A king's crown is said to be solid gold but may be made of lead and covered with gold. When it is weighed in air, the scale reads .475 kg. When it is submerged in water, the scale reads .437 kg. (a) is it solid gold? (b) if not, what percentage by mass is gold? density of gold = 19.3 * 10^3...

Newton and Leibniz are generally credited with the invention of calculus, aren't they? Last night I saw on TV that Archimedes actually knew some basic concept of calculus but his description of it was "lost" to the world until a recent "re-discovery." What do you think the history of...

Hi everyone, im having some difficulties with a certain homework problem I'm on. Up until now I've solved all buoyancy problems knowing its weight in air and its weight submerged in a liquid (generally water). In this particular problem, it gives the weight of the block completely...